Orange - Data Mining Fruitful & Fun. Wow, just stumbled upon this, I didn't know it, I think. A GUI interface with a node interface for defining data analyses and visualizations, where these nodes are programmed in Python. The entire interface is built with QT, so there is also an OSX version of it. If you need to sift through larger amounts of data, this is definitely worth a look, especially since it is open source and you don't lose anything there.